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김영환,증본건,조형호,김우열,정상명구 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.9
An Al_(88)Y₂Ni_(10) amorphus alloy was found to exhibit a Large elongation reaching about 30% in the low temperature range of 450 to 475K. The temperature range agrees well with that where a lot of the primary fcc-Al particles with a ultrafine grain size precipitate homogeneously. It is therefore concluded that the appearance of the large elongation is due to a crystallization-induced plasticity phenomenon. The new phenomenon may be interpreted to occur through the sequent process of inhomogeneous deformation along shear plane, followed by preferential precipitation of Al particles on the shear plane resulting from the deformation-induced increase in temperature and then propagation of the deformation site to other site resulting from the precipitation-induced strengthening in the deformed area.
강일구,김희중,증본건 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.5
Alloying effects on the crystallization temperature and the crystallization process of Fe-Cr-C-B alloys were studied by DSC and X-ray diffractometer. The crystallization temperature linearly increased with increasing the concentration of Cr and metalloids. The activation energy for crystallization was in the range of 83-97 ㎉/㏖, and its dependence to composition was similar to that of the crystallization temperature. Three crystallization processes of primary, eutectic and polymorphic were occurred with alloy composition. The final stable crystalline phases were α-(Fe, Cr) (bcc), (Fe, Cr)₃B(orthorhombic) and (Fe, Cr),B (tetragonal) in Fe_(47)Cr_(35)B_(18) alloy, (Fe, Cr)₃(C, B) (orthorhombic) in Fe_(41)Cr_(35)C_(12)B_(12) alloy, and α-(Fe, Cr)(bcc) and (Fe, Cr)₃ (C, B) (orthorhombic) in all Fe-Cr-C-B alloys except Fe_(41)Cr_(35)C_(12)B_(12) alloy.